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[AIX][XCOFF] emit traceback table for function in aix

Authored by DiggerLin on Dec 11 2020, 2:50 PM.

Description

[AIX][XCOFF] emit traceback table for function in aix

SUMMARY:

  1. added a new option -xcoff-traceback-table to control whether generate traceback table for function.
  2. implement the functionality of emit traceback table of a function.

Reviewers: hubert.reinterpretcast, Jason Liu
Differential Revision: https://reviews.llvm.org/D92398